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Within the forum_get_discussion_neighbours() function of forum when the discussions timemodified (last post) is the same, there is a bug that does strange things when calculating the prev and next discussions. Note that, in real life, this is really hard to achieve, but in tests, when multiple discussions and post can be created by generators in the same second (specially when the test machine is quick), chances of facing that problem are higher. By adding 1 second wait, we ensure that the discussions won't have the same timemodified (last post) and workaround the problem. No mater of that, the problem deserves an issue to be created so we guarantee from code that it also works ok when the same timemodified (last post) situation happens.